Metal-working machine.



L. F. & R. SGHULZE.

METAL WORKING MACHINE.

APPLICATION FILED mm. 19, 190B.

Patented Jan. 12, 1915.

6 SHEETS-SHEET 1.

%. fl m L. F. & R. SGHULZE.

METAL WORKING MACHINE.

APPLICATION FILED b30119, 1908.

1,124,538, Patented Jan. 12, 1915.

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METAL WORKING MACHINE.

APPLIOATION FILED DEC. 19, 1908.

Patented Jan. 12, 1915.

6 SHEETS-SHEET 3.

Patented Jan. 12, 1915.

L. P. & R. SGHULZE.

METAL WORKING MACHINE. APPLIUATION TILED DIE-30.19, face.

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METAL WORKING MACHINE.

APPLICATION FILED DEC.19, 150s.

Patented Jan. 12, 1915.

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METAL WORKING MACHINE.

APPLIGATION FILED DBG.19, I908.

1,,m4,53& Patented Jan. 12, 1915.

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LEON F. SCHULZE AND ROBERT SCHULZE, F CLEVELAND, OHIO.

METAL-WORKING MACHINE.

' Specification of Letters Patent.

Application filed December 19, 1908. Serial 'No. 468,280.

To all whom it may concern:

Be it known that we, LEON F. SCHULZE and Ronna'r ScHULzE, citizens of the United States, residing at Cleveland, in the county .of Cuyahoga and State of Ohio, have inis disclosed in our prior Patent No. 732,453,

granted June 30, 1903, wherein a suitable head carried bv a frame and provided with a plurality of live spindles andchucks for the stock to be operated upon, is arranged to cooperate with a suitable tool holder also mounted on the frame and carrying various shaping, forming, cutting off, threading,

and other tools all controlled by suitable operating devices for the production of certain articles such as screws, nuts, studs and other parts.

' The present invention, however, relates more particularly to an improved; form, of locking device for the spindle hea'dfwhereby the bolt is positively withdrawn and is yieldingly shifted into locking position so that there is no danger of the locking bolt becoming stuck in its socket, or of there being any jar incident to the locking operation; to an improved tool support sildably mounted and having a plurality of faces for receiving tools; to threading devices carried by the frame and permitted to return independently of the tool support, as well as to other improved features which are employed in conjunction with these devices already mentioned. 1

The invention may be still further briefly summarized as consisting in the construction and combination of parts hereinafter set forth in the following description, drawings and claims.

Referring to the drawings, Figure 1 is a left side elevation of the machine when. facing the live spindles and standing at the rear of the machine; Fig. 2 is a right side elevation of a portion of the machine and with parts drawn in section to more clearly show the construction thereof; Fig. 3 is a sectional view upon the line IIIIII of Fig. 1 looking to the right of such figure; Fig. 4 is a section upon theline IV--IVof Fig. 1; Fig. 5 is a section uponthe line V-V of Fig. 1; Fig. 6 is an end elevation; Fig. 7 is a detail view of the locking bolt and associated parts; Fig. 8 is a detail view, part in'section, of the driving and thread lenglh adiusting sleeve; Fig. 9 is a detail view of the trip for throwing the clutch lever; 'Fig. 10 is a detail view of the dog shifting mechanism; and Fig. 11 is an elevation of the face of one of the cam disks showing the clutch operating cams.

In carrying out our invention .any preferred form and construction of parts may be employed so long as they possess the necessary characteristics, but We have shown one form in the drawings which meets the requirements with great efiiciencv, and in such embodiment the several parts and elemerits of the machine will be taken up and described in their order.

Frame.-The frame 1' of the machine is of any preferred or desirable construction, but it is essential that it shou d have suitable bearings 2 for the cam shaft 3, bearings 4 for the head or auxiliary driving and cam shaft 5, and bearings 6 for the worm shaft 7. The frame is further provided with a suitable casing 8 in which the s indle head is mounted. and with guides 9 for the tool slide to be described. The frame is still further provided with suitab e guide wavs 10 to receive transverse tool slides 11 which are common in machines of this type, and

which do not form any part of the present driving pulley 14. Keyed to the shaft 3 is a cvlindrical cam wheel 15 having thereon suitable cams 16 which are adapted to engage a roller 16 on the tool slide, to be described, for shifting it to and from the work at the proper time. The shaft 3 is further provided with a spur gear 17, shown particularly in Fig. 1, and in dotted lines in Fig. 3, which meshes with a spur gear 18 of equal size and mounted upon the shaft 5. This shaft 5 is keyed to the gear 18 and in transverse alinement with substantially the center of the spindle head, has a cam disk 19, for a purpose to be described. This shaft may. also. be provided [with any suitable mechanism for rotating the spindle head intermittently in the bringing of the several tool spindles into succes s1ve position for operation. This mechanism is not shown in this application as it is no part of this invention, but is completely disclosed in our priorpatent referred to. It will be seen that by the rotation of the pulley 14 there will bea drivingof the worm wheel 13, the cam shaft 3, the cam wheel 15, the auxiliary cam shaft 5, and the cam disk 19, and the operation of these several elements imparts the suitable driving to all parts, with the exce tion of the spindles and the threading too s, which is provided for by additional mechanism to be described.

Spindlehead.-Rotatably mounted within the casing 8 is a spindle head '20, best shown in Figs. 1 and 4, and it is provided preferably with five live spindles 21 each provided with and driven by 'a gear 22 through a gear 23 mounted upon a spindle and tool driving shaft 24 extending to the rearof the machine, and there mounted in a bracket 25 secured to the frame 1. This shaft 24 projects beyond the end of the bracket and is provided with a driving pulley 26. Each of the live spindles 21 is provided with suitable mechanism for shifting and holding the stock, but these devices are not shown in this application as they do not constitute any part of this invention. As

previously suggested, this head 20 receives an intermittent rotation through suitable mechanism not shown, and driven by the shaft 5. The head 20 is also provided with suitable openings 27, shown in Figs. 4 and 7, which receive socket members 28 provided with openings extending radially with respect to the head and forming pockets for the locking bolt, to be described.

Spindle head locking device-Each socket member projects beyond the periphery of the head 20 and is cut away beyond such periphery, as shown, on substantially a diameter lying in a plane cutting the central axis of the head at right angles thus leaving a half-roundprojecting portion 29. The opening in the portion 29 of the socket is preferably tapered, as shown in Fig. 7, and

for a purpose to be later disclosed.

Extending prefer'ablyat an angle to the vertical axis of the machine, as shown in Fig. 4. the casing 8 is provided with a portion 30 adapted to receive a bushing 31 having a half-round portion 32 extending beyond the inner wall of the casing 8 and forming a counterpart of the portion 29. This portion 32 is provided with an-opening, the wall of which tapers to a smaller diameter at the outer end of the extended portion 32, so that a complete socketis formed by the opening in the portion 29 and the opening in the portion .32. Slidably mounted in the bushing 31 is a bolt 33 havloose washer and the bolt. The forked end v 38 of a shifting lever 39, pivoted upon a suitable stud 40 carried by the frame, engages between these two washers and upon the shifting of the lever in one direction the bolt is yieldingly shifted into its socket and upon the movement of the lever in the opposite direction the bolt is positively withdrawn. The lever 39 is provided with an arm 41 carrying at its end a friction roller 42 adapted to be engaged by a cam 43 for shifting the lever and moving the bolt into its socket and then by a cam 44 which shifts the lever in the opposite direction and posi tively withdraws the bolt. These cams 43 and 44 are carried by the cam disk 19 upon the shaft 5. It will be seen from the foregoing construction that just before the cycle of operation of the machine requires the spindle head to be rotated one step, the cam 44 will engage-above the friction roller 42 and will positively withdraw the bolt 33 through the mechanism just described and will hold it out of engagement for a sulficient length of time topermit the rotation of the'spindle head. When this is completed the cam roller engages the cam 43 and shifts the lever in the opposite direction thus bringing the end 38 of the arm 39 down against the washer 37 and against the tension of the spring 37 with the result that the bolt 33 is yieldingly forced into its socket formed in part by the portion 32 of the bushing and the portion 29 of the socket member 28.

Tool support and t0oZs.-The tool support forms the subject matter of a division of this application, such divisional application bearing the filing date October 4, 1912, Serial No. 723,939. Slidably mounted upon the guide ways 9 is a tool slide 45 which carries in the base thereof and in alinement with the lowermost stock spindle, a stock length gage bar 46 adapted to be held in place by means of a set screw 47 and it will be seen that'when the stock is moved forward through the stock spindle by the stock shifting mechanism it will abutiagainst the end of the stock length gage bar 46, which has been previously adamuse 24 and having faces 49, four of which are provided with longitudinal T-shaped slots for receiving the head of a .bolt 51 secured in suitable tool holders '52. In the instance shown in the drawings, the first tool holder carries a suitable turnin tool 53; the second a suitable drill 54; 'whi e two ofthe remaining. faces carry tool holders for special tools in this instance shown as an internal threading tool or tap and an external threading tool or die, andsince their construction is varied to accommodate them to the mechanismfor bringing about the desired results which will be described in conjunction with the tap and die operating mechanism, these specialtool holders will not be described further at this time.

Tap and die and their operating mechanism.--Mountedin one of the slots 50 is a die tool holder 55 providedwith a rod support 56 and a sleeve portion 57, and this sleeve portion, as well as a portion of the block, has a longitudinal slot or key Way 58 therein, as, shown clearly in Fig. 2 and Fig. 3, for the purpose of receiving a key 59 secured in a spindle sleeve 60. This sleeve 60 supports and forms a bearing for the die spindle 61 which is held against longitudinal movement with respect to such sleeve by a nut 62 and a socket member 63 which receives the thread cutting die 64. It will be seen from this construction that the sleeve and die spindle move together and that the former has a relative movement with respect to the sleeve portion 57 of the tool block, but that the sleeve is held against rotation with .the spindle by the key 59 which slides freely in the slot 58.

The die spindle 61 extends to the rear loosely through a high speed gear 65 through a gear sleeve 66 integral therewith and rotatably mounted in the bracket 25, and through a low speed gear 67 integral with the gear sleeve 66 and out beyond the end thereof, as shown in Fig. 2. The opening in the sleeve 66 and gear 67 is larger than the spindle for the purpose of receiving a driving sleeve 68 loose upon the spindie but which rotates the spindle through a suitable key 69 and is held in any adiusted position longit dinally by means of a set screw 70. The feature of adiustment of this sleeve longitudinally upon the spindle serves as a means for regulating and adiusting the length of the threads produced by the die. The spindle 61 normally has a tendency to thrust toward the rear of the mach ne or to the left. as shown in Fig. 2, and this is brou ht about by means of a spring 71 in an opening 61 in the die spind e 61, and engaging a plug 72 secured in the end of the d e spindle as shown. The opposite end of the spring 71 engages a head 73 upon the end of a rod 74 carried .bv a -supporting member 75 secured to the end of the bracket 25. The drive from the two gears 65 and 67 is conveyed to the sleeve 68 through a pawl 76 swiveled upon the side face of the gear 67 and held in engagement by means of a which is broken by a transverse recess 82.

This construction brings about the following result, namely, that when the pawl is driving against the wall 81 and the sleeve is moved longitudinally with the spindle by the movement of the tool slide as will be described, the pawl will finally register with the recess 82 andthe spindle will cease to be driven inasmuch as the pawl will pass through the recess freely around the sleeve without driving it, but upon the pawl being rotated around'the sleeve relatively in the 8 opposite direction, the wall will be engaged and the spindle will be rotated and the drive will continue as long as the gear 7 clutch member 86, loose upon said shaft. and

carrying a low speed driving gear 87 mesh ing with the low speed gear 67 of the spin- 1C0 dle mechanism already described. The two clutch members 84 and 86 face each other and are separated sufficiently to admit between them. and without being in engagement with either, a driving clutch mem er 88, which issecured to the shaft 24 and is provided with clutch teeth on each of its side faces for cohperation with the cl tch teeth of the two clutch membe s 84 and 86. This driving clutch member 88 is provided with a groove 89 receiving pins 90. shown in dotted lines in Fig. 5. and carried by the side members 91 and 92 of the bifurcated end of a clutch shift ng le er 93 mounted upon a pivot 94 secured in the frame. This 1 lever 93 is provided with an arm 95 extending toward the end of the frame and having a block 96 which takes a ainst the frame on one s de. and is provided with bevel faces 97 and 98 forming a po nt as shown and for 1 a purpose to be described. Secu ed in the 'frame is a bushing 99 pro ided with an mounted and it is adapted to force the trip outward. The end of the trip has beveled cam faces 105 and 106 forming a point similar in every respect to the point formed by the faces 97 and 98. Threaded on the end of the shank 102 is a nut 107 adapted to limit the outward movement of the plunger. The endof the arm 95 of the lever is extended beyond the block 96 and is adapted to be engaged by acam 108 carried by a cam disk 109 keyed to the shaft 3, and to be thrown downward against the concentric cam 110 andheld in this position by reason of the fact that the point of the block and the point of the trip have passed each other, and the cam face 106, through the action of the spring on the plunger 101, is endeavoring to force the arm 95"downward. This position of the arm prevails until its end passes beyond the end of the cam 110 and when in this position the driving clutch member 88 is in a neutral position with respect to the other clutch members so that there is no drive of the threading spindle. When the end of the arm 95 reaches the end of the cam 110, however, the cam operation between the trip and the block 96 causes the arm 95 to be thrown downward to its extreme position when the driving clutch member 88 will be thrown into engagement with the low speed clutch member and the spindle will be driven at low speed which is during the threading operation, as will be disclosed later. This position of the lever 93 remains the same until the end thereof is engaged by a cam 111 carried by the cam disk 109 when the lever will be raised until the'point of the block 96 passes the point of the trip when the latter will throw the lever to the left, as shown in Fig. 1, and the driving clutch member will be in engagement with the high speed clutch member 84, and the spindle will be rotated at high speed which is utilized in running off the die.

Spindle shifting and release device.T his mechanism is for the purpose of causing the threading spindle to be carried yieldlngly forward toward the stock and storing power in the yielding device before the threading spindle is driven, so as to insure a clean starting of the thread and after the threading operation has been accomplished. then finally to release the threading spindle so that it may return to normal position by the tendency of its spring. Loosely mounted 1n the rod support 56 and in suitable supports 112 carried by the bracket 25 and preferably arranged between the driving gears, already described, and separated from each other, is a rod 113 which carries at its forward end a nut 114 in which is secured one end of a spring 115. This spring has its opposite free end 116 normally in engagement with a pin 117 secured in the rod support 56 and the arrangement'is'such that there is a tendency of the rod to rotate in a tion 120 adapted to extend down and engage the end of the key 59, and to remain in such position during the movement of the die spindle forward and during the threading operation, but just previous to the running off of the die to be shifted out of alinement with the key so as to permit the spindle to return to normal position. The rocking of the rod 113 is brought about by a lever 121 slidably mounted upon the rod, but held against relative rotary movement with respect thereto by a flattened portion 122 on the red engaging a similarly shaped opening in the lever. The end of this lever 121 engages a cam face 123 carried by the arm 92 of the lever 93, as shown in Figs. 1, 5 and 6. \V hen the lever 121 is at a low point on the cam face 123, it normally assuming such position by reason of the action of the spring 115, or in other words when the driving clutch member is in any position out of engagement with the high speed clutch member, the rod 113 is holding the nose 120 of the dog 118 in alinement with the end of the key 59, but when the lever 93 is shifted and the end of the lever 12,1 travels up the cam surface, or in other words when the driving clutch member is in engagement with the high speed clutch member, then the nose of the dog is shifted out of alinement and the threading spindle may travel back as soon as the thread cutting tool is released from the stock. Mounted on another one of the faces of the toolsupport is a tool holder 124 which carries a spindle 125 in all respects similar to the spindle 61, and it is moved and controlled in its forward movement by means of a dog 126 on the rod 113 and is driven through a sleeve 127 similar in all respects to the sleeve 68. The gearing. however, is varied in that the low speed drive is communicated from the low speed driving gear 87 through the gear 67., through the gear 65, through the high speed driving gear 85' to a gear 128 having a sleeve portion, not shown, but similar in all respects to the sleeve portion 66, and carrying a member 129 which corresponds to the gear 67 of the other spindle, but which is not provided with teeth inasmuch as the drive, both for cutting the thread and the running off of the threading tool, is accomplished through the gear 128 as will later he described. This member 129 carries a pawl 130 for engagement with the recess 131 in the sleeve 127. The driving of this second threading s indle from the main driving shaft 24 is rought about in the following masses manner. When the clutch member 88 is thrown into engagement with the low speed driving gear 87, the gear 67 of the first spindle is driven to cause the cutting of the thread by the first spindle. This rotation is conveyed through the gear 65 and the high speed clutch member 84 which is at that time out of engagement with the clutch member 88, whereby the 'same rotation is conveyed to the gear 128 of the second spindle, and since gears 65 and 128 are of the same size the second spindle will be' driven 'at the same speed as the first spindle through the threading operation; Upon the completion of the threading operation and the throwing of the clutch member 88 into engagement with the high speed clutch member 84 both gears 65 and 128 are driven at high speed.

Complete operatiom-Jn giving the complete operation it will be assumed that the machine is running and the description of the operation will start with the slide 45 at the extreme rear or to the left as shown in Fig. 2 and with the several stock spindles supplied with pieces in the various stages of completion and further that the spindle head is locked in position. Upon-the forward movement of the slide 15, which is accomplished by means of the cam 16 on the cam wheel 15, the rod support 56 upon the tool supporting member slides along the rod 113 as does the end 116 of the spring 115 along the pin 117 until the rod support bears against the spring 'sufl'lciently to cause the rod 113 to be shifted longitudinally with this slide and tool support. This forward movement of the rod 113 and the dog 120 carried thereby causes the latter to engage the key 59 and shift the spindle 61, and this forward movement continues against the tension of the spindle retracting spring 71 until the thread cutting tool engages the stock when the spindle 61 will rotate freely with the stock. This rotation is permitted on account of the fact that dur-' ing the forward movement of the slide 45 and the spindle 61, the arm 95 of the clutch lever 93 is resting upon the concentric cam 110 carried by the cam disk 109 and the clutch member 88 is not in engagement with either of the clutch members 84 or 86, and

- the forward movement of the slide 45 coning about the cutting of the thread. The

compression of the spring 115 prior to the driving of the spindle through the gear 67, just described, forces the thread cutting tool, by means of the rod 113, the dog. 11 8, and the key 59, firmly into engagement with the stock thereby giving it an opportunity to get a perfect hold upon the stock so that the thread is started perfectly and without milling away any of the material. As the threadin spindle is carried forward, however, an is cutting its thread, the sleeve 68 is drawn into the sleeve 66 of the gear until the pawl 76 reaches the transverse recess 82 in the sleeve when thepawl will pass out through this recess and will revolve about the sleeve without conveying any further drive to the threading spindle, and by the adjustment of this sleeve 68, upon the threading spindle, the driving of the same is varied and in that way the length of the thread may be varied also. continues to rotate about the sleeve until the cycle of operation of the machine causes the cam 111', carried by the cam disk 109, to engage the arm 95 of the clutch shiftin lever and move it upward until the point 0? the block 96 on the arm 95, and the point of the trip, pass each other when the clutch shifting lever 93 will be thrown to the left carrying with it the clutch member 88 and causing the coupling of the high speed driving gear 85 to the gear of the threading spindle. This rotation, in the above instance, is also counter clockwise, but is at a greater speed than the rotation of the stock spindle whereby the threading tool is run oil from the stock. The shi ing of the lever 93, in the meantime, however, causes thecam face 123 to rock the lever 121 and with it the shaft 113 which operation moves the nose 120 bf the dog 118 out of the path of the key 59 so that when the threading tool is released from the stock, the threading spindle will return quickly to normal position through the action of the spring 71, where it remains until the tool. slide 45 has completed its work and has returned to its rear position. The threading spindle 125, which is similar in all respects to the spindle 61, is operated in the same manner, except that the drive is accomplished through the gearing of the other spindle in the manner already described. Upon the return of the slide to its rear position, the cycle of operation of the driving mechanism of the machine causes the cam 44 carried by the cam disk 19, to engage the friction roller and draw the bolt 33 positively from its socket thereby releasing the spindle head to its rotating mechanism which is of a character such that the head is turned one step, but since it forms no part of this invention it is'not shown, but is fully described in our prior patent. Upon The pawl 76 the completion of the shifting of the. spindle head one step, the friction roller of the bolt shiftin lever 39 is engaged by the cam 43 and shifted in a manner such that the end 38 engages the loose washer 87 and compresses the s ring until the bolt 33 is yieldingly force into its socket and the spindle head is again locked in position. By this arrangement the bolt is positively withdrawn and is yieldingly brought into locking position so that all jar and danger of the bolt sticking in its socket are eliminated.

Having described our invention, I we claim '1. In a metal working machine, in combination, a frame, a spindle head, a tool carrier slidably mounted upon the frame, means for shifting the tool carrier, at threading device also mounted upon the frame and adapted to be moved forward by the tool carrier and to return to initial osition with respect to the frame indepen ently of the tool slide, and means for returning said threading device to normal position.

2. In a metal working. machine, in combination, a frame, a spindle head, a tool support slidably mounted in the frame, means for shifting said tool support to and from the spindle head, a thread cutting device mounted in the frame and in said tool support and having a normal tendency to the rear and away from the head, means whereby said tool support may shift said thread cutting device toward the spindle head during the forward movement of the former, and means for automatically releasing said thread cutting device to its normal tendency upon the completion of the cutting of the thread whereby said thread cutting device may assume its initial position with respect to the frame. 3. In a metal working machine, in combination, a frame, a spindle head, a tool support slidably mounted upon the frame, means' for shifting said tool support to and from the spindle head, a rotary thread cutting device mounted in the frame and adapted to be moved forward by the tool support and when released from. the frame to return freely to its initial starting position with respect to the frame, means normally tending to return said thread cutting device to its initial starting position, independent of. the tool support, andmeans for releasing said thread cutting device to its normal tendency upon the completion of thecutting of the thread.

4. In a metal working machine, in combi-' nation, a frame, a spindle head, a tool support mounted upon the frame, means for shifting said tool support to and from the spindle head, a thread cutting device adapted to be moved into engagement with the stock, means for moving the thread cutting device into engagement with the stock, means for causing a relativedriving opera.- tion between the stock and the thread cutting device, and means for storing the power of the thread cutting device shifting means prior to the relative movement of the stock thread cutting spindle toward the stock, a

spring for storing the power of the spindle shifting means prior. to the rotation of the spindle for bringing about sufficient pressure between the die and the stock to insure a clean starting of the thread, and suitable driving means for the'thread cutting spindle, said driving means being inoperative to drive the spindle until after suflicient pressure has been stored up in said spring.

6. In a metal working machine, in combi nation, a frame, a spindle head carried thereby, a rotary thread cutting spindle in conjunction therewith, a tool slide, means whereby said tool slide may shift said'thread cutting spindle toward said spindle head and start the. thread, means for releasing said thread cutting device from said slide, means for returning said thread cutting device to the frame independently of said tool slide, and means for driving the several parts.

7. In a metal working machine, in combination, a frame, a stock holding device carried thereby, a thread cutting spindle slid ably mounted in the frame, means for moving the same to and from the stock, driving mechanism, a driving sleeve carried by said spindle and adapted to be driven by said driving mechanism and provided with means whereby it may release itself from the driving mechanism when the desired length of thread has been out, said driving sleeve beingsusceptible of adjustment with respect to the spindle to vary the length of the thread cut, and means for driving the several parts.

8. In a metal working machine, in combination, a frame, a stock holding device, a slide mounted upon said frame, a thread cutting device, a member carried by said slide 'and adapted to normally assume a position to engage said thread cutting deviceupon the forward movement of the slide, means normally tending to shift said thread cutting device into a rearward position, means for driving said thread cutting device, and means actuated thereby for shifting the member carried by the slide and releasing the thread cuttingdevice to its normal tendency upon the completion of the cutting of the thread. 7

9. In a metal working machine, in combiits initial starting position with respect to nation, a frame, a stock spindle, a tool support mounted upon the frame and adapted to slide thereon, means for shifting said tool support, a threading device,,a member carried by said tool support and normally in a position to engage the threading device and move it forward with the tool support, a driving shaft for said threading'device, two sets of gears between said driving shaft and said threading device, one for use during the threading operation and the other for use during the running off of the threading tool, a clutch member for connecting either of saidsets of gears with the driving\shaft,

means for throwing said clutch member, and,

means actuated thereby for shifting the member carried by the tool support and permitting the return of the threading device upon the-completion of the cutting of the thread.

10. Ina metal working machine,'in combination, a stock holding device, a slide, a. thread cutting device, a dog carried by said slide and adapted to normally engage the thread cutting device,.means normally tending to shift the latter into a rearward position away from the stock holding device, a driving shaft, two sets of gears between the same and the thread cutting device, means for coupling either of these sets of gears with the driving shaft, and means actuated by the coupling means for shifting said dog and releasing the thread cutting device upon the completion of the cutting of the thread.

11. In ametal working machine, in combination, a frame, a stock holding device, a tool slide mounted upon the frame, means for shifting said slide, a threading spindle mounted upon the frame, means normally tending to shift the same into an extreme rearward position, a dog carried by the slide and normally assuming a position to engage said spindle and shift it upon the for- .ward movement of the slide, a driving shaft,

suitable gearing between the driving shaft and threading spindle for driving the same during the cutting of the thread. and another arrangement of gears for driving the threading spindle the threading tool, suitable clutch mechanism between the driving shaft'and said gearing whereby either may be coupled to the driving shaft, and means actuated by said clutch mechanism for shifting the dog carried by the slide and to release the threading spindle upon the completion of the cutting of the thread.

12. In a metal working machine, in combination, a frame, a stock holding device, a slide mounted upon said frame, means for shifting the same, a threading spindle mounted in the frame. a dog carried by said slide and normally assuming a position to engage thethreading spindle upon the forthreading spindle for ing the cutting of the threads, and another duringthe running off of.

' b nation,

ward movement of the slide to carry the former into engagement with the stock, means normally tending to shift said spindle into a rearward position, a driving shaft, a train of gears between said shaft and said driving the same durarrangement of trained gearing for driving the spindle during the running 03 of the threading tool, a clutch member for coupling either of said trains of gears shaft, a member for shifting said clutch, and means actuated the dog and releasing the threading spindle upon the completion of the cutting of the thread.

13. In a metal working machine, in combination,'a frame, a stock holdingdevice, a tool support slidably mounted upon the frame, a threading spindle slidably mounted in said tool support and also slidably mounted in the frame, a dog mounted upon said tool support and normally in a position to engage the threading spindle and shift the same toward the stock upon the forward movement of the tool support, suitable driving mechanism for the threading spindle, a device for controlling the operation of the driving mechanism, means actuated thereby for shifting said dog and releasing the threading spindle upon to the driving by said member forshifting' D the completion or the threading operation, and means normally tending to shift said threading spin- 'dle to the rear.

14. Ina metal working machine, in combination, a frame. a stock holding device, a tool support slidably mounted upon the frame, a threading spindle slidably mounted and slidably mounted in the toolsupport, a

dog carried by said rod and adapted to normally'assume a position such that it may engage the spindle upon the forward movement of the slide, means operated by the controlling device for shifting said rod and operating said dog to release the spindle upon the completion of the cutting of the thread, and means for returning said spindle automatically to normal position.

15. In a metal working machine, in coma frame. a stock holding device, a tool support slidably mounted upon the frame. a threading spindle slidably mounted upon the frame and slidably mounted in said tool support, a member carried by said spindle'and guided in the tool support, means for driving said spindle, a controlling device for said means, a dog carried by the tool support and adapted normally to assume a position to engage the member carried by the spindle whereby the latter is moved forward upon the forward movement of the means whereby the tool support, means whereby the controlling device may shift said dog spindle, and means normally tending toreturn said spindle to its rearward position.

16. In a metal working machine, in combination, a frame, a stock holding device, a tool support slidably mounted in the frame, a threading spindle slidably mounted on the frame and slidably mounted in the tool support, means carried by the frame for. drivin said spindle, a controlling device for sai driving means, a rod slidably mounted in the tool support, a do carried by said rod, :1 spring carried by said rod and adapted normally to hold said dog in a position to engage the threading spindle, and also being adapted to be engaged by the tool support to cause said dog to shift the spindle, means actuated by the controlling device of the driving meansfor shifting said rod and'said dog and thereby releasing the threading spindle, and means normally tending to shift the latter to the rear.

17. In a metal Working machine, in combination, a frame, a stockholding device, a. tool support slidably mounted on the frame, a threading spindle slidably mounted on the frame and slidably mounted in the tool support, a member secured to the spindle and guided in the tool support, a rod slidably mounted in the frame and in the tool support, a dog carried by said rod, a spring carried by said rod and adapted to be engaged by the tool support and cause the shifting of the rod and the engagement of the dog with the member carried by the spindle whereby the latter is forward movement of the tool support, said spring also serving normally to hold said og in a position to engage said member, a lever carried by said rod, suitable driving gears for said threading spindle, a controlling device for said gears, and a cam member carried by said device and adapted to engage the lever carried by the rod and shift the latter to cause the release of threading spindle by the shifting of the dog, and means normally tending to return said threading spindle to normal position.

18. In a metal working machine, in combination, a frame, a stock holding device, a member slidably mounted upon the frame, a thread cutting device also mounted upon the frame, a yielding device between said slidable member and the threading device whereby the latter is yieldingly shifted toward the stock, driving mechanism for the parts during the threading operation, and driving of the parts during the threading operation is delayed until the yielding member has accumulated sutiicient power to bring about a clean starting of the thread.

19. In a metal working machine, in combination, a frame, a stock holding device, a

and release the shifted forward by the member slidably mounted upon the frame, means for shifting the same to and from the stock, a thread cutting spindle slidably mounted upon the frame, means carried by said slidable member for engaging the spindle and shifting the same toward the stock upon the forward movement of the former, a yielding device between said member and said spindle, suitable driving mechanism for said-threading spindle, means for controlling said driving mechanism and arranged in a manner such that there is no drive conveyed to the spindle until suflicient power has been accumulated by the yielding device to bring about a clean starting of the cutting tool.

20. In a metal working machine, in combination, a frame, a stock holding device, a member slidably mounted upon the frame, means for shifting the same to and from the stock,'a thread cutting spindle slidably mounted upon the frame, means carried by said slidable member for engaging the spindle and shifting the stock upon the forward movement of the former, a spring between said member and said spindle, suitable driving mechanism for said -threading spindle, means for controlling said driving mechanism and arranged in a manner such that there is no drive conveyed to the spindle until sufiicient power has been accumulated by the spring to bring about a clean starting of the cutting tool.

21. In a metal Working machine, in combination, a frame, a rotary stock spindle, a member slidably mounted upon the frame, means for shifting the same to and from the stock spindle, a threadin spindle slidably mounted in the frame, a 0g carried by the slidable member and adapted to engage the threading spindle upon the forward mor'ement of the former, a spring between said dog and the slidable member, driving mechanism for said threading spindle, controlling means for said driving mechanism and arranged to permit the threading spindle to rotate with the stock spindle until suflicient power has been stored in the spring to cause the thread cutting tool to receive a clean starting in the cutting of the thread.

22. In a metal working machine, in combination, a frame, a stock holding device, a member slidably mounted upon the frame, a plurality of thread cutting devices, means carried by said slidable member and adapted upon the forward movement of the same to carry all of the threading devices forward toward the stock, and means whereby said threading devices may return independently of the slidable member and independently of each other.

member slidably mounted, upon the frame,

same toward the I a plurality of thread cutting devices suitab y mounted, dogs carried by said slidable member and adapted upon the forward movement of the same to engage the corresponding thread cutting device and shift the same forward toward the stock, means for shifting said dogs to release all of said threading devices, and means whereby said threading devices may return independently of the slidable member and independently of each other.

24. In a metal working machine, in com bination, a frame, a stock holding device, a:

slide mounted upon the frame, a plurality of thread cutting devices also mounted upon the frame, a dog for each thread cutting 11 testimony whereof we aflix our signa- 25 tures in presence of two witnesses.

LEON F. SGHULZE. ROBERT SCHULZE. Witnesses:

Amen H. Bnms, B. W. Baocxaa'r.

the 20 

